C/C++ :: Overtime And Payroll Calculations

When you execute my code you'll notice the regular pay for the first example will calculate to $500 when it is only supposed to calculate to $400. I'm also having a problem adding up the totals of the regular pay and overtime pay to get a total payroll which is displayed in one cout statement. 95% of my code is correct, I'm just having these two issues. To make it more clear hear is my assignment:

The regular working hour for an employee is 40 hours a week. Sometimes employees work over time. When the employee works 40 or less hours, the regular pay is calculated as number of hours worked times the hourly rate. When the employee works over time i.e. beyond 40 hours then the employee's pay has two components a) regular pay (40 hours X hourly rate), and 2) overtime pay (the overtime hours beyond 40 X time and half of the hourly rate).

void compute(incomeInfo *ptrI, int count) {                                                
    for (int i = 0; i<count; i++)  
    if (ptrI->hours <= 40) {
        ptrI->regPay = ptrI->hours * ptrI->hRate;
        ptrI++;

[Code] ....